. investigators poring over information found in bin laden's pakistan compound say he was plotting to kill the president by shooting down air force one. bin laden was also working on a diabolical scheme to mark the upcoming tenth anniversary of the 9/11 attacks. martha raddatz has a special report coming up on "good morning america." >>> the fbi is launching its own investigation into the widening hacking scandal involving rupert murdoch. investigators are looking into whether murdoch's new york-based news corp employees tried to access cell phone messages and records of 9/11 victims and their families. murdoch is defending his company to "the wall street journal," a newspaper that he owns saying his executives made only minor mistakes. >>> insanity defense may be in the works for a new york man charged with killing an 8-year-old boy. a judge ordered the suspect to undergo a mental evaluation. levy aron has told attorneys he hears voices and has had hallucinations. jeff pegues has details. >> reporter: no matter how much they hear about the case. >> i don't know how anybody could do that.